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Investments in and Advances to Joint Ventures - Summary of Financial Information for Consolidated Joint Ventures (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Schedule Of Equity Method Investments [Line Items]      
Current assets $ 2,401,171   $ 2,462,400
Total assets 5,449,144   5,487,962
Current liabilities 1,865,470   1,915,644
Total liabilities 2,903,412   2,953,473
Total joint venture equity 2,453,794   2,416,389
Revenue 1,554,360 $ 1,535,676  
Costs 1,200,377 1,210,827  
Net income attributable to Parsons Corporation 66,203 39,750  
Net income attributable to noncontrolling interests 15,584 15,243  
Consolidated Joint Ventures      
Schedule Of Equity Method Investments [Line Items]      
Current assets 497,357   519,450
Noncurrent assets 8,494   9,841
Total assets 505,851   529,291
Current liabilities 320,772   296,774
Noncurrent liabilities 1,944   2,203
Total liabilities 322,716   298,977
Total joint venture equity 183,135   $ 230,314
Revenue 196,358 202,017  
Costs 164,954 171,148  
Net income attributable to Parsons Corporation 31,404 30,869  
Net income attributable to noncontrolling interests $ 15,584 $ 15,243